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Old 01-19-2004, 12:21 AM   #1
Xzinum
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Member#: 50987
Join Date: Dec 2003
Chapter/Region: E. Canada
Default question about drivetrain on 89 wagon

I've been arguing with my friend. I've been trying to explain to him that most 4WD cars or trucks (mostly truck) if you were to elevate one wheel off the ground thus simulating a wheel spin, that the other wheels won't turn at all since the diffs are open diffs. My question is, were the old wagons like that? Or did they have some sort of LSD?


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Old 01-19-2004, 03:14 AM   #2
Flowmastered87GL
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It depends on which 89 wagon you have....

If its a part time 4WD system and you lift a single tire off the ground and 4WD is engaged the tire off the ground will spin (50% of power going there) and another tire on the other end of the car will spin too (touching the ground, thus propelling the car)

If its the full time 4WD (AWD) system then maybe, all the power could go to that one wheel. However most of the full time systems had a diff lock switch that you could use to split the torque 50-50
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Old 01-19-2004, 06:34 AM   #3
Xzinum
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from what he told me, it was a 4WD...not AWD. He said that you had to put it on manually.

Now just to get things straight, the AWD system on 89 wagons for example....were they computer controlled like the one we have now?

Plus, should'nt the AWD be better than the 4WD in the snow for example. I was explained that on an AWD car, the wheel that spins the most is likely to get less power to it...right?
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Old 01-19-2004, 04:27 PM   #4
Flowmastered87GL
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hmmmm im not sure which is better in the snow.... i drove both my impreza with AWD and my GL with 4WD and both were pretty sure footed. The 4WD was more likely to swing the arse out when you gas it though

I dont think the AWD system was computer controlled... maybe on the autos, but the manuals I think were all viscous diffs or something.... (please dont quote me on this)
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Old 01-21-2004, 03:27 PM   #5
DerFahrer
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4WD is not computer-controlled. The most technological thing about the old Scoob 4WDs were the "pushbutton" part-times like my XT. Push the button, and a soleniod would engage the gears that drove the rear wheels. No center diff.

AWD manuals have no electronic devices whatsoever. There is a viscous coupling that transfers power based entirely on fluid thermodynamics. If the back wheels spin too much, the fluid will get hot and this sends power to the front. VERY basic, but it works well.

AWD automatics are computer-controlled. There is a solenoid (Duty Solenoid C, to be specific) that changes the fluid pressure inside the AWD clutch pack to send more power where it's needed. Regular Subaru AWD autos are a 90/10 split, the new VTD systems are a 45/55 split.
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